2023 BMW Open – Singles

Defending champion Holger Rune defeated Botic van de Zandschulp in a rematch of the previous year's final, 6–4, 1–6, 7–6(7–3) to win the singles tennis title at the 2023 Bavarian International Tennis Championships. In the third set of the final, Rune recovered from being a double-break down and saved four championship points en route to victory.

Seeds
The top four seeds received a bye into the second round. • # Holger Rune (champion)

• # 🇺🇸 Taylor Fritz (semifinals)

• # 🇩🇪 Alexander Zverev (second round)

• # Botic van de Zandschulp (final)

• # 🇦🇷 Sebastián Báez (first round)

• # 🇮🇹 Lorenzo Sonego (second round)

• # 🇪🇸 Roberto Carballés Baena (first round)

• # Marc-Andrea Hüsler (second round)

Seeds
• # Aslan Karatsev (qualified)

• # 🇨🇿 Vít Kopřiva (qualifying competition)

• # 🇮🇹 Riccardo Bonadio (qualifying competition, withdrew)

• # 🇨🇿 Zdeněk Kolář (qualifying competition)

• # 🇮🇹 Flavio Cobolli (qualified)

• # Alexander Ritschard (qualified)

• # 🇯🇵 Shintaro Mochizuki (first round)

• # 🇩🇪 Daniel Masur (first round)

Qualifiers
• # Aslan Karatsev

• # 🇩🇪 Marko Topo

• # Alexander Ritschard

• # 🇮🇹 Flavio Cobolli